Hide 'which' erro message when 'pg_config' is not found
Hide 'which' erro message when 'pg_config' is not found

umake/make,renatocf/make,umake/make,renatocf/make,igorbonadio/make,umake/make,umakefile/make,renatocf/make,umakefile/make,igorbonadio/make,umakefile/make,igorbonadio/make